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v3.25.1

Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Parenthetical) (Details) $ in Millions | Mar. 31, 2025 USD ($)
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Business Combination, Separately Recognized Transactions [Line Items] |
Total consideration | $ 96
Other Acquisitions [Member] | Maximum [Member] |
Business Combination, Separately Recognized Transactions [Line Items] |
Total consideration | $ 50

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- Definition Business combination consideration. + References No definition available. + Details
Name: | bro_BusinessCombinationConsideration
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bro_OtherAcquisitionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |